摘要
分布于贺兰山的上三叠统陆相碎屑岩与鄂尔多斯盆地的同期沉积物之间的关系,历来多有争议。本文对比了其沉积环境的演化趋势,认为,贺兰山的环境是由冲积扇演化为湖泊,水体由浅变深;鄂尔多斯盆地的沉积环境是由小湖泊演化为深大湖泊,然后复变为小湖泊,最后成为冲积平原。二者演化途径相差甚大,应属两个分立的盆地。
The authors' research reveals That the sedimentary environments for Late Triassic sedi- ments in Helanshan and Ordos regions are quite different in their evolution history.The sedi- mentary environment for Late Triassic sediments in Helanshan region began with alluvial fans, through the development of shallow lake,and ended with deep lake.The sedimentary envi- ronments in Ordos region in the same time,however,began with a small and shallow lake which developed into a large and deep one in middle Late Triassic.A small lake again ap- peared and then evolved in fluvial plain at the end of Late Triassic.This makes the authors believe that Helanshan and Ordos regions were two seperated basins in Late Triassic.
出处
《地质科学》
CAS
CSCD
北大核心
1992年第2期124-130,共7页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
中国科学院自然科学研究基金项目。
关键词
贺兰山
延长群
沉积
鄂尔多斯盆地
Helanshan region
Yanchang Group
Upper Triassic
Sedimentary environments
Ordos region
